Unfortunately, I'm not really familiar with MacOS, as I only use Windows and Linux Mint.
So I can't tell you whether there are any other game-specific settings for Macs.
If everything seems fine with your mods and drivers, maybe your system is just too old.
You could try turning down your graphics settings. From the Main Menu, go to: Options > Video Settings.
Try to set the following values low and test again:
- Biome Blend: OFF
- Graphics: Fast
- Chunk Builder: Threaded
- Smooth Lightning: OFF
- VSync: OFF
- Mipmap Levels: 0
- Render Distance: 8
- Simulation Distance: 5
- Max Framerate: Unlimited
- Clouds: OFF
- Particles: Minimal
- Entity Distance: 100%
Also try to experiment with fullscreen mode or windowed mode.
If your performance gets better, you can try to increase your graphic settings again.
Hope this helps.
